Back then, n0nce told you he used one and posted some feedback about it:
App works well on all operating systems, intuitive and simple, but with enough options like different currency conversions etc.; it also works with Electrum.
Build quality is good, although the screen cover is just plastic (like all other hw wallets I've seen so far), which means if you carry it in your pocket it will scratch up fast. I hope they will fix this in the future, but unfortunately many wallets that have a larger screen, have this issue.
What's quite interesting is the password entry. It's done by tapping the case on either side in specific locations. Compared to the BB01, where the password was entered via the GUI on the host computer, this is much better since you can't write a software that tries brute-forcing it and you can't key-log it either. It's also very hard to e.g. video record (or watch) someone enter the password and properly see what they're inputting, compared to e.g. a two-button input sequence that may be spotted from a distance.